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Walker Branch Watershed: DOE's Canary in a Cage Michael Huston the Effects of Pollution and Climate Change on Forests Are Being Studied in Oak Ridge

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Walker Branch Watershed: DOE's Canary in a Cage Michael Huston the Effects of Pollution and Climate Change on Forests Are Being Studied in Oak Ridge ON THE COVER ORNL is developing technologies to more rapidly determine the order of life's building blocks-the of DNA-for the national Human Genome Project. One of its achievements has been imaging plasmid (circular) DNA molecules (sample images surround the baby) using an atomic force microscope. For details, see the articles starting on p. 18 and p. 22. The Oak Ridge National Laboratory Review is published quarterly and distributed to employees and others associated with ORNL. The address of the editorial office is Building 4500-South, M.S. 6144, Oak Ridge, TN 37831-6144. Telephone: internal, 4-7183 or 4-6974; commercial, (615) 574-7183 or (6 15) 574-6974; FfS, 624-7183 or 624-6974. If you have changed your address and want to remain on the mailing list, please notify the editorial office. ORNL is managed by Martin Marietta Energy Systems, Inc. for the Department of Energy under contract DE-AC05-840R21400 Printed in the United States of America. Available from National Technical Information Service, U.S. Department of Commerce, 5285 Port Royal Road, Springfield, VA 22161. ISSN 0048-1262 Editor Carolyn Krause Associate Editor Jim Pearce Consulting Editor Alex Zucker Designer Vickie Conner Technical Editing Mike Aaron Electronic Publishing Bob Eldridge Photography, Graphic Arts, and Printing and Duplicating departments Volume 25 Number One, 1992 2 Walker Branch Watershed: DOE's Canary in a Cage Michael Huston The effects of pollution and climate change on forests are being studied in Oak Ridge. 10 Technology for the Future Battlefield Katie U. Vandergriff and James H. Hannah ORNL' s automated techniques could improve the safety and efficiency of rearming battle tanks. 18 New.Technologies for DNA Sequencing Bruce Jacobson ORNL is developing new technologies for rapidly determining the structures of human genes. 22 Covering All the Bases: ORNL Probes the Human Genome Jim Pearce Researchers conduct DNA sequencing and genome mapping studies at ORNL. 40 ORNL as a Supercomputer Research Center Jim Pearce ORNL's new parallel supercomputer will be used for alloy design and groundwater modeling. 44 Paving the Way to Superconcrete A. J. Mattus Using the polystyrene of throwaway cups, ORNL researchers have developed a very strong concrete. 51 A New Look at Supercritical Water Carolyn Krause Waste treatment technologies and steam systems may benefit from basic supercritical water studies. 54 Small Mammals as Environmental Monitors Sylvia Talmage and Barbara Walton Small mammals, such as shrews, can be reliable bioindicators of chemicals in the environment. DEPARTMENTS 58 A wards and Appointments 62 Pick a Number-Joseph Fourier and his heat flux law 64 User Facilities-A new mission for Holifield Heavy Ion Research Facility 68 Educational Activities-New training opportunities for students and university faculty 71 . R&D Updates-Bulk Shielding Reactor permanently shut down; C02 claim disputed by ORNL model; studies of Brazil's rain forest; ORNL's corrective action plan approved; report on advantages of demand-side management; cold neutron source for Advanced Neutron Source promising 77 Technical Highlights-Fuzzy-logic chip for controlling robot; studies of vegetation regrowth at Mt. St. Helens; global chemical pollution; space conditions simulated at ORNL 86 Technology Transfer-CRADA signing at ORNL witnessed by President Bush; new microwave furnace developed; CRADA involving ORNL, UT, and Dow Chemical; Optics MODIL CRADA; licenses for check valve technology and Raman spectral library Oak Ridge National Laboratory is a multiprogram, multipurpose laboratory that conducts research in the physical, chemical, material and life sciences; infusion, fission, and fossil energy; and in energy conservation and other energy-related technologies. Walker Branch Watershed: DOE's Canary in a Cage By Michael A. Huston w people realize that in the middle of Park. Over this time, the Walker Branch ne of the nation's largest Superfund Watershed project has addressed such problems as 1tes lies one of the nation's oldest and the effects of atmospheric sulfur pollution on Fbest-known ecological research areas, Walker forests, the transport of contaminants through The effects of Branch Watershed. Like the proverbial canary in a soils, and the role of forests in the carbon cycle cage carried by miners to detect the presence of (and potentially the greenhouse effect). pollution and poisonous gas, Walker Branch Watershed Walker Branch Watershed is located near the climate provides an indication of the ecological condition center of the Oak Ridge Reservation on a diagonal of the Oak Ridge environment, as well as a between Oak Ridge National Laboratory and the change on yardstick to measure the health and recovery of Oak Ridge Y -12 Plant. The lower portion of the forests are streams and forests damaged by past activities. Walker Branch Valley has been flooded by the being studied Because Walker Branch Watershed is an Tennessee Valley Authority's (TVA's) Melton ecosystem, composed of interacting plants, Hill Reservoir, forming an embayment that is in Oak animals, soils, and water, it serves as a barometer passed daily by thousands of ORNL employees Ridge. of many different components of environmental on their way to and from work. The Watershed health. Research Area, which is Walker Branch Watershed, named for the uphill from the pioneer family whose homestead gave the stream, embayment, lies on or "branch," its name, was established as a the crest of research site on the Oak Ridge Reservation by the Chestnut Atomic Energy Commission (AEC) in 1967 for Ridge. A 3-D computer three purposes: (1) providing baseline values for image of Walker Branch Watershed unpolluted natural waters, (2) contributing to is superi mposed knowledge of the on a pre-1940 movement (cycling) of aerial photo of chemicals in and their Chestnut Ridge, losses from natural Bethel Valley, and ecosystems, and the Clinch River. (3) enabling the This topographical construction of models map shows the for predicting the effects sub-watersheds that integrate of human activities on biogeochem ical the landscape. processes across To meet these general the landscape and goals, the AEC and characterizes Department of Energy ecosystem (DOE) have funded the variability. The Walker Branch 97.5-ha site has Watershed project for an elevation range more than 20 years and of 265 to 360 m (870 to 1180 ft) expanded research and is forested efforts to include the with oak and much larger area of the hickory trees and Oak Ridge National some pi ne and Environmental Research cove hardwoods. Number One, 1992 3 WALKER BRANCH WATERSHED: DOE'S CANARY IN A CAGE LEGEND ~ CHICKAM AUGA LIMESTONE Och ~ FAULT ZONE [] KNOX GROUP Ol' k ~ SYNCLINE 0 CONASAUGA GROUP ec II ROME FORMATION e.r The location of the Walker Branch Watershed and the geology of the area are shown here. ORNL is underlain by the Chickamauga Limestone Formation. Because of the repeated pattern of ridges and Area would probably be the Walker Hills valleys caused by thrust faults in the Oak Ridge subdivision. area; the soils and geology of the Knox group dolomite on which Walker Branch Watershed is Monitoring the Health located are virtually identical to those of Black Oak Ridge, on which most of the city of Oak of Forests and Streams Ridge is built. Although research issues on Walker Branch The watershed is essentially a suburban forest have changed over the years, the project has located in the greater Knoxville metropolitan area, continued to collect basic data on the condition surrounded by DOE's research and production and health of the forest and streams. The guiding facilities and several industrial parks, and within principle of watershed research is that the sight of two of TVA's large coal-burning power condition of an ecosystem can be monitored by plants. Its suburban location makes Walker measuring changes in its chemical composition. Branch unique among the nation's major ORNL scientists in the Environmental Sciences watershed research areas because the rest are Division (ESD) determine how the chemical located in remote mountainous regions used composition of the 250 forested acres of the primarily for recreation and timber production. Walker Branch Watershed is changing by Were it not for the unusual history of the Oak calculating the amount of an element that comes Ridge Reservation and its role in the Manhattan into the watershed in rainfall and subtracting the Project, the Walker Branch Watershed Research amount that leaves the watershed in the stream. 4 Oak Ridge National Laboratory REVIEW This method, known as 60 120 "mass balance," can JEQ TVA Emissions indicate whether the 1978 • 50 D WBW Throughfall so4 100 ecosystem is accumulating or losing a particular - WBW Wet Deposition S04 40 80 element or whether the amount of that element in its composition is at a 30 60 steady state. At other watershed research sites, 20 40 changes in stream chemistry, such as 10 20 increased nitrate concentrations, have 0 0 provided the first warning 1972 73-74 75 76-77 78 79 81-83 84 85 86 that insects were defoliating trees in parts of Long-term monitoring shows that sulfate deposition on the Walker the forest. The effect of Branch Watershed has declined in proportion to decreases in Tennessee Valley Authority sulfate emissions. insects was detected in the stream chemistry because removal of leaves reduced the amount of nitrogen A fundamental piece of evidence in the sulfur "ORNL being taken up by trees, while insect droppings pollution story was provided by an experiment scientists. released nitrate that moved rapidly into the conducted by ESD's Steve Lindberg and Chuck streams. Garten in which whole trees on Walker Branch determine Long-term monitoring at Walker Branch has Watershed were labeled with radioactive sulfur- how the documented the beneficial effects of the pollution­ 35. Low levels of radioactivity in the sulfate chemical control devices installed by TV A on its local coal­ washed off the tree leaves by rainstorms burning power plants.
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